<template>
  <div>
    <el-card>
      <!-- 为ECharts准备一个具备大小（宽高）的Dom -->
      <div id="userChange"
           style="width: 350px;height:400px;"></div>
    </el-card>
  </div>
</template>
<script>
import * as echarts from 'echarts'

export default {
  data () {
    return {

    }

  },
  methods: {

  },
  created () {

  },
  mounted () {
    // 基于准备好的dom，初始化echarts实例
    var chartDom = document.getElementById('userChange');
    var myChart = echarts.init(chartDom);

    // 指定图表的配置项和数据
    var option;

    option = {
      tooltip: {
        trigger: 'axis',
        axisPointer: {
          type: 'cross',
          crossStyle: {
            color: '#999'
          }
        }
      },
      toolbox: {
        feature: {
          dataView: { show: true, readOnly: false },
          magicType: { show: true, type: ['line', 'bar'] },
          restore: { show: true },
          saveAsImage: { show: true }
        }
      },
      legend: {
        data: ['居民增加量', '员工量', '用户总量']
      },
      xAxis: [
        {
          type: 'category',
          data: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月'],
          axisPointer: {
            type: 'shadow'
          }
        }
      ],
      yAxis: [
        {
          type: 'value',
          name: '总量',
          min: 0,
          max: 250,
          interval: 50,
          axisLabel: {
            formatter: '{value} 人'
          }
        },
        {
          type: 'value',
          name: '增量',
          min: 0,
          max: 25,
          interval: 5,
          axisLabel: {
            formatter: '{value} 人'
          }
        }
      ],
      series: [
        {
          name: '居民增量',
          type: 'bar',
          data: [2.0, 4.9, 7.0, 23.2, 25.6, 76.7, 135.6, 162.2, 32.6, 20.0, 6.4, 3.3]
        },
        {
          name: '员工增量',
          type: 'bar',
          data: [2.6, 5.9, 9.0, 26.4, 28.7, 70.7, 175.6, 182.2, 48.7, 18.8, 6.0, 2.3]
        },
        {
          name: '用户总量',
          type: 'line',
          yAxisIndex: 1,
          data: [2.0, 2.2, 3.3, 4.5, 6.3, 10.2, 20.3, 23.4, 23.0, 16.5, 12.0, 6.2]
        }
      ]
    };


    // 使用刚指定的配置项和数据显示图表。
    option && myChart.setOption(option);
  }
}
</script>
